<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="renderer" content="webkit">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=0">
</head>
<body>
    <script >
       // 声明常量
       const SCHOOL = 'pop';
       // 常量值一定要赋初始值
       // 常量值不能修改
       // 块儿级作用域
       // 对于数组和对象的元素修改，不算对常量的修改，不会报错
       const TEAM = ['pipi','pop'];
       // 不会报错，但是修改无效
       TEAM.push('ccc')
    </script>
</body>

</html>